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Full text of "Text Book Of Mechanical Engineering"

218

Bracket for Lever.

drill. The latter is then packed in the slide rest, and firmly
grasped, when the drilling may proceed. The hosses are surfaced
to the scribed mark, and to the shaped lever; the diameter being
gauged by callipers. When these are finished, the sides are
marked out as at F, and the lever next clamped on an f angle
plate ' placed on the table of a planing machine (see G), being
packed at such an inclination that the edge may be planed • and
four settings are of course necessary. The angle plate is an
appliance which will be found useful for a variety of purposes.
Now finish off the lever by draw-filing and ernery cloth. If the
work be too long to allow the bosses to be turned, the latter
are tooled as separate pieces, having a portion of the lever attached,
and are afterwards welded to the handle by the smith.

II. Brackets for Regulator Lever (Fig. 229).—First
centre at the ends as at B, and punch; then try in the lathe to see
if there is sufficient stuff at the middle. Turn the shank to
dimensions, gauging \vith callipers, and cut the screw thread in
the lathe at the same time ; the taper of the shank being obtained
by setting the top slide of the rest by the requisite amount, and
giving a hand feed to the tool. Polish while in the machine, with
file aad emery, all but the collar, which maybe left rough, because
it is to be afterwards cut; the diameter then being made equal
to that across the corners of the hexagon. Now remove from the
lathe, and, setting again on the table in the position B, line out
the flat cheeks of the fork, and shape or mill these. Upon the
tooled surface thus obtained further lining is performed as shewn.
at c, the centres being again placed exactly horizontal. Strike
the pin hole and punch. Drill the hole In machine vice to
gauge, and, bolting down to the centre of a slotting or vertical-
milling table i>, tool all round with hand and machine feed
Once more line out, this time for the fork slot as at E, and also
mark a circle for drilling, making sure that the line** is taken for
this, not b. Drill the hole last marked, and take out the rest of tlie
fork slot in the slotting machine, finishing by cutting the oblique
portion In the vice by chipping arid filing (F). It may here be
mentioned that all "bright work is held in trie vice between plates of
lead resting on the jaws, and called * vice clams.' Lastly, cut the
hexagon on the collar bf dividing out as at G, and filing off dae flats.